Manufacture of heat-insulating materials.



COATING OH PLASTIC.

No. 845,365. 7 PATENTED FEB. 26, 1907. B. LUTTGEN.

v MANUFACTURE OF HEAT INSULATING MATERIALS.

APPLIOATIOR FILED nno.24,1sos.

Me Q2 upon the .EBERHARD LUTTGEN,

UNITED STATES PATENT oF Ioit.

BEY & MATTISON COMPANY, OF RATION OF PENNSYLVANIA.

OF AMBLER, PENNSYLVANIA, ASSIGNOR TO KEAS- AMBLER, PENNSYLVANIA, A CORPO- MANUFACTURE OF HEAT-INSULATING MATERIALS.

Specification of Letters Patent.

Patented Feb. 26, 1 907.

Application filed December 24, 1906. Serial No. 349,229.

To (all whom it 1nay concern:

Be it known that I, EBERHARD LUTTGEN, residing at No. 808 Lindenwoli avenue, Ambler, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in the Manufacture of He ateInsulating Materials, whereof the following is a specification, reference being had to the accompanying drawings.

My present invention relates to a process for the production of heat-insulating structures, such as are produced from a plastic combination of a porous mineral cement,

such as carbonate of magnesia, with a fibrous such as asbestos.

also relates to the resulting oses the substance,

The invention structure, for which practical p heat-insulating structures to whic my invention is applicable are composed almost entirely of inorganic materials and may thereforebe-classified as inorganic heat-insula-,

It is a well-known fact that the efiiciency of a heat-insulating material depends very largely upon its porosity-that is to say,

proportion that the volume of entrapped air bears to the whole volume of the insu ating mass. Some of the mineral substances now employed in the manufacture of heat-insulating coverings are comparatively lacking in voids or air-cells and are consequently dense and of slight or mediocre value as retarders of radiated heat. Other materials, notably carbonate of magnesia and 'plaster-of-paris,

when properly prepared, are and are therefore efficient as heatorous,

It is the object of the process insul ators.

which I have invented and will now describe to increase by artificial means the natural V 4 thereby to enhance porosity of structures or coverm s' made from these and other similar substances, and

heir value as heat-insulators.

I will describe my invention as applied to heat-insulating structures a s mad.eofnesinm carbona e and asbestos fiber; u 1 mus e un ers ood tha e materials may be employed. L

In carrying out my process it is convenient to employ an apparatus such as is figured through the mass, which is thus 5 Y tering the accom anying drawings, in which; Figure represents the apparatps tical section, and Fig. 11 represents a plan view of the same.

The plastic mixture is prepared in the tank 1, the n agnesiunLcLarhona e and water being introduced by way of the pi e 2, an e asbestos fil er by way of t e manhole 3.

Proper proportlons of these materials are introduced and mixed in the tank. After the mixture is properly proportioned air-pressure is introduced by way of the pipe 4. The lower end of the tank is conical, ending in an outlet-pipe 5, controlled by the valve 6. When the proper degree of pressure is attained, the valve 6 is turned to open the outlet, and the plastic mixture is driven by the air-press with th outlet-pipe. 'The mold is not shown in the drawings, as it may be of any suitable shape, depending upon the shape of the structure which is to be produced. The tank 1 is a strong and pressure-proof vessel, and

, it may-be of any convenient form. The top of the tank is equipped with a safety-valve 8 for the escape of air over a given pressuresay thirty or forty pounds to the squareinch. According to my invention the pipe 4, by which the com ressed air is supplied to the tank, instead of terminating above the mold runs down through the centerof the tank and terminates near the bottom thereof. It is perforated at intervals with small holes 9, and from these holes the compressed air which is to be used for ejecting the'plas'tic material from the tank is drivedn agitate aerated and inflatedb reason of the o 1e air-u es i s arrangemen the tank through the pipe serves a! three fpld purpose-narnely, it thoroughly mixes the pressure Where y thepla'stic material is forced into the mold. It will also be ob-' e into a mold which is connected M A the combined materials, is aerateshori leavens the regltinmagma, an it supp 'es 5 almost simultaneouswith its ejection, so,

with innumerable the mold where it ermanentliy that while it is still filled air-bubbles it passes into quickly sets, trapping the air in the small air-spaces formed 1n the strucration, thereby producing a 7 plastic mixture which is to be driven into the 845,365 n W heat-insulating material which is at the 2. The process of increasing the efliciency same time li hter and more efficient b reaof heat-insulating structures, which consists son of the mechanical intro duction and en- After the tra pin of the air. p ha: set, it will be found plastic structure ed my invention, I

aerating t e same by compressed air driven into immediately had an opportunity to es cape; and allowing it to set in the mold.

to have its porosity and li htness increased propor-T iona e y o e amount of entrapped air l V J signed in forcing the; aerated mass into a mold before the enn i sulating sub peptaole by the escape of the compressed air for mixing, aerating and then ejecting the j plastic material, immediately following its l a suitable mold Where it is allowed to set in I its aerated condition.

. 3. A heat-insulating structure molded from a plastic mass of inorganic insulating I materials, and containing both the'air-spaces l which result from the natural porosity of the I materials, and

; by the mechamcal m'ection of air into the I plastic mass prior tom In testimony whereof I have hereunto yname, at Philadelphia, Pennsylva- 2lst day of December, 1906.

nia, this i EBERHARD LUTTGEN.

Witnesses v JAMES H. BELL, l

E. L. FULLERTON. 

